Palaemon (prawn) has an open circulatory system and jointed legs. Which group does it belong to?
Arthropoda
Open circulatory systems are those where blood, rather than being sealed tight in arteries and veins, suffuses the body and may be directly open to the environment at places such as the digestive tract. Palaemon (prawn) belongs to the phylum Arthropoda. Arthropods are invertebrates with an open circulatory system, paired jointed legs and a chitinous exoskeleton.